An electrical network of an aircraft comprises: several main generators, several high voltage direct current networks powered by one of the generators in normal operation, several low voltage direct current networks powered by one of the high voltage direct current networks, several converters to transfer energy from one of the high voltage direct current networks to one of the low voltage direct current networks, the different converters being independent and isolated from each other, each converter being dedicated to one of the high voltage networks and to the low voltage direct current network, a load designed to be powered in normal operation by the main generators and in backup operation by one of the low voltage direct current networks, the backup operation being put into place when at least one of the high voltage networks is no longer powered by the associated main generator in normal operation.

An electrical network of an aircraft comprises: several main generators, several high voltage direct current networks powered by one of the generators in normal operation, several low voltage direct current networks powered by one of the high voltage direct current networks, several converters to transfer energy from one of the high voltage direct current networks to one of the low voltage direct current networks, the different converters being independent and isolated from each other, each converter being dedicated to one of the high voltage networks and to the low voltage direct current network, a load designed to be powered in normal operation by the main generators and in backup operation by one of the low voltage direct current networks, the backup operation being put into place when at least one of the high voltage networks is no longer powered by the associated main generator in normal operation.

The present disclosure relates to systems and methods for connecting to an auxiliary power source and operating a water heater. One exemplary aspect is directed to a water heater configured to heat a volume of water. The water heater can include a first heating system configured to operate at a first power and a second heating system configured to operate at a second power. The second power can be less than the first power. The water heater can further include a first AC connection configured to receive externally supplied AC power at a first voltage and a second AC connection configured to receive externally supplied AC power at a second voltage. The second voltage can be less than the first voltage. The water heater can use only the second heating system when the second AC connection receives the externally supplied AC power at the second voltage.

The present disclosure relates to systems and methods for connecting to an auxiliary power source and operating a water heater. One exemplary aspect is directed to a water heater configured to heat a volume of water. The water heater can include a first heating system configured to operate at a first power and a second heating system configured to operate at a second power. The second power can be less than the first power. The water heater can further include a first AC connection configured to receive externally supplied AC power at a first voltage and a second AC connection configured to receive externally supplied AC power at a second voltage. The second voltage can be less than the first voltage. The water heater can use only the second heating system when the second AC connection receives the externally supplied AC power at the second voltage.

A hybrid electrical power supply control system for providing electrical energy to at least one load, said load alternating between a first low energy consuming operational modus and second high energy consuming operational modus, and wherein said control system comprises: a first power source comprising at least one battery unit and arranged to be switched to said load for supplying electrical energy; a second power source comprising at least one energy harvesting unit and arranged to harvest and convert energy into Direct Current, DC, energy, and wherein said converted DC energy is stored in a charge collecting unit, and wherein said second power source is further arranged to be switched to said load for supplying electrical energy; an operational modus detecting unit, arranged for detecting whether said load being in said first or in said second operational modus; a power source switching unit, connected to said operational modus detecting unit for receiving said detected first or second operational modus of said load, and arranged to connect said first power source to said load upon said load being detected to be in said first low energy consuming operational modus, and arranged to connect said second power source to said load upon said load being detected to be in said second high energy consuming operational modus.

A hybrid electrical power supply control system for providing electrical energy to at least one load, said load alternating between a first low energy consuming operational modus and second high energy consuming operational modus, and wherein said control system comprises: a first power source comprising at least one battery unit and arranged to be switched to said load for supplying electrical energy; a second power source comprising at least one energy harvesting unit and arranged to harvest and convert energy into Direct Current, DC, energy, and wherein said converted DC energy is stored in a charge collecting unit, and wherein said second power source is further arranged to be switched to said load for supplying electrical energy; an operational modus detecting unit, arranged for detecting whether said load being in said first or in said second operational modus; a power source switching unit, connected to said operational modus detecting unit for receiving said detected first or second operational modus of said load, and arranged to connect said first power source to said load upon said load being detected to be in said first low energy consuming operational modus, and arranged to connect said second power source to said load upon said load being detected to be in said second high energy consuming operational modus.

Various implementations described herein are directed to systems, apparatuses and methods for managing one or more loads connected to one or more power sources using one or more smart outlets. Apparatuses described herein may include smart outlets configured to communicate with one or more controllers and responsively connect and disconnect electrical loads connected thereto. Methods described herein may include signaling and/or controlling one or more loads from a group of loads to connect to or disconnect from one or more power sources.

Solar electricity is used more efficiently and at lower cost via the technique of interrupted DC power. Interrupted DC removed the spark problem from high voltage DC circuits, allowing their use with normal appliances. Wasteful and expensive inductor based voltage changes were avoided by adjusting solar panel output voltage via loading. This provided prioritization of use among appliances. Furthermore, the extreme decrease in sparking obtained by interrupted DC allows for the manufacture and use of lower cost direct current circuit breakers that are self powered and provide protected circuits of greater than 99% direct current purity.

Solar electricity is used more efficiently and at lower cost via the technique of interrupted DC power. Interrupted DC removed the spark problem from high voltage DC circuits, allowing their use with normal appliances. Wasteful and expensive inductor based voltage changes were avoided by adjusting solar panel output voltage via loading. This provided prioritization of use among appliances. Furthermore, the extreme decrease in sparking obtained by interrupted DC allows for the manufacture and use of lower cost direct current circuit breakers that are self powered and provide protected circuits of greater than 99% direct current purity.

An all-electric, battery powered industrial or commercial mobile power unit is provided that can include a number of features. The mobile power unit can include a DC electrical energy source configured to produce a voltage of approximately 300-450 VDC. The mobile power unit can be configured so as to produce a user programmable voltage output and/or a user selected voltage output of either 480 VAC 3-phase, 208 VAC 3-phase, or 240 VAC single-phase. The various output configurations are controlled by software with a system controller of the mobile power unit. Methods of use are also provided.